Abstract
Abstract. In this paper particle categorization and absorption properties were discussed to understand transport mechanisms at different geographic locations and possible radiative impacts on climate. The long-term Aerosol Robotic Network (AERONET) data set (1999–2015) is used to estimate aerosol optical depth (AOD), single scattering albedo (SSA), and the absorption Ångström exponent (αabs) at eight locations in North Africa and the Middle East. Average variation in SSA is calculated at four wavelengths (440, 675, 870, and 1020 nm), and the relationship between aerosol absorption and physical properties is used to infer dominant aerosol types at different locations. It was found that seasonality and geographic location play a major role in identifying dominant aerosol types at each location. Analyzing aerosol characteristics among different sites using AERONET Version 2, Level 2.0 data retrievals and the Hybrid Single Particle Lagrangian Integrated Trajectory model (HYSPLIT) backward trajectories shows possible aerosol particle transport among different locations indicating the importance of understanding transport mechanisms in identifying aerosol sources.
Highlights
Natural and anthropogenic aerosols suspended in the atmosphere are characterized by their diverse sources, varying particle dynamics, lifetimes, interactive mechanisms, and surface and column distributions
In this study we investigate aerosol characteristics over North Africa and the Middle East using eight Aerosol Robotic Network (AERONET) sites in the region, namely, Solar Village (24◦ N, 46◦ E), Bahrain (26◦ N, 50◦ E), Mezaira (23◦ N, 53◦ E), Cairo (30◦ N, 31◦ E), Sedé Boqer (30◦ N, 34◦ E), Tamanrasset (22◦ N, 5◦ E), Saada (31◦ N, 8◦ W), and Ben Salem (35◦ N, 9◦ E) (Fig. 1)
Clean scenarios are observed over the Solar Village, Bahrain, and Mezaira mostly during the summer season; this is probably due to less traffic pollution as schools are off and many locals travel to cooler places to escape high summer temperatures in this www.ann-geophys.net/34/1031/2016/
Summary
Natural and anthropogenic aerosols suspended in the atmosphere are characterized by their diverse sources, varying particle dynamics, lifetimes, interactive mechanisms, and surface and column distributions. In this study we investigate aerosol characteristics over North Africa and the Middle East using eight AERONET sites in the region, namely, Solar Village (24◦ N, 46◦ E), Bahrain (26◦ N, 50◦ E), Mezaira (23◦ N, 53◦ E), Cairo (30◦ N, 31◦ E), Sedé Boqer (30◦ N, 34◦ E), Tamanrasset (22◦ N, 5◦ E), Saada (31◦ N, 8◦ W), and Ben Salem (35◦ N, 9◦ E) (Fig. 1).
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